APA (7th ed.) Citation

Geological Survey (U.S.). (1911). Conventional signs adopted by U.S. Geographic Board. [publisher not identified].

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). Conventional Signs Adopted by U.S. Geographic Board. Washington: [publisher not identified], 1911.

MLA (9th ed.) Citation

Geological Survey (U.S.). Conventional Signs Adopted by U.S. Geographic Board. [publisher not identified], 1911.

Warning: These citations may not always be 100% accurate.